Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Solution-processable hybrid perovskite photovoltaics combine potential for low-cost fabrication with high power-conversion efficiency. The observation of slow transient and hysteretic effects observed in perovskite-absorber devices, which has severely affected current density–voltage (J-V) measurements and efficiency determination in early reports, has spurred further efforts in exploring the working mechanisms of such opto-electronic devices. Ion migration towards the electrode regions has been recently and independently reported by several group as a source of hysteresis and self-sustained field within various 3D perovskite semiconductors. A variety of dynamics have been reported, which differ in magnitude and time scale, depending both on the specific device architecture and, in particular, on the adopted charge extraction layer, highlighting a considerable effect of contact interfaces on transients in perovskite based devices.
I will first report on the role played by charge extracting layers on the slow transient behavior of CH3NH3PbI3 perovskite based solar cells. Such transients are found to notably modify the open circuit voltage also in the very first J-V scans of so called “hysteresis-free” devices integrating a Phenyl-C61-butyric acid methyl ester (PCBM) charge extraction layer. I will highlight how, under device operation, iodide ions migrate to the electron extracting layer: this effect requires a pre-conditioning of the device, i.e. a repetition of J-V scans, is needed to achieve completely stable J-V characteristics under illumination. The interaction of PCBM with migrating ions and the effect of PCBM on the photoconductivity of perovskite semiconductors will also be illustrated.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.